Bug 1539632 [wpt PR 16036] - Verify Sec-Fetch-Site is correct for domains with trailing dots., a=testonly

Automatic update from web-platform-tests
Verify `Sec-Fetch-Site` is correct for domains with trailing dots.

`example.com` != `example.com.`. These are clearly distinct origins,
and we don't currently consider them to have the same registrable
domain (though there's a bit of a question about that. See
publicsuffix/list#792), so they ought
to compare as `cross-site`

This patch adds a test for this behavior, and teaches the test harness
to resolve domains that end in `.test.`.

Closes w3c/webappsec-fetch-metadata#15.

Bug: 843478
Change-Id: Ic71afeda69f274c23c19608177756d882307a59d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1536180
Commit-Queue: Mike West <mkwstchromium.org>
Reviewed-by: Łukasz Anforowicz <lukaszachromium.org>
Cr-Commit-Position: refs/heads/master{#644261}

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wpt-commits: 22be9a97638436380f88d871ecefac3f1aebfe53
wpt-pr: 16036

UltraBlame original commit: 0a934b7e89ef947c2709720d115a98691dcb4add

Author: marco-c